The prefix "lipo-" is associated with which substance?

The prefix "lipo-" is derived from the Greek word "lipos," which translates to "fat." This prefix is commonly used in scientific and medical terminology to denote substances or conditions related to fats or lipids. For example, "lipid" refers to a group of organic compounds that are insoluble in water but soluble in organic solvents, and they encompass fats, oils, and certain vitamins. The strong association between "lipo-" and fat makes it the clear choice among the options provided.

The other options do not correctly align with the meaning of "lipo-." The prefix related to dark would be "melano-," the term linked to inflammation would typically incorporate "itis," and the term associated with loosening isn't represented by "lipo-." Hence, the strong connection of "lipo-" to fat confirms the accuracy of the selected answer.